Minispares own product L/H.
Call it a hub, bearing carrier, upright or swivel pin, on the Mini it's all the same thing.
You'll need these (FAM2391=left, FAM2390=right) new hubs if you are converting to disc or "if your old hubs will no longer support the bearings properly".
All new and ready to use.
Either replace your old one or start a kit to convert to disc.